110 lines
4.3 KiB
CMake
110 lines
4.3 KiB
CMake
# - Find the native PNG includes and library
|
|
#
|
|
# This module searches libpng, the library for working with PNG images.
|
|
#
|
|
# It defines the following variables
|
|
# PNG_INCLUDE_DIRS, where to find png.h, etc.
|
|
# PNG_LIBRARIES, the libraries to link against to use PNG.
|
|
# PNG_DEFINITIONS - You should add_definitons(${PNG_DEFINITIONS}) before compiling code that includes png library files.
|
|
# PNG_FOUND, If false, do not try to use PNG.
|
|
# PNG_VERSION_STRING - the version of the PNG library found (since CMake 2.8.8)
|
|
# Also defined, but not for general use are
|
|
# PNG_LIBRARY, where to find the PNG library.
|
|
# For backward compatiblity the variable PNG_INCLUDE_DIR is also set. It has the same value as PNG_INCLUDE_DIRS.
|
|
#
|
|
# Since PNG depends on the ZLib compression library, none of the above will be
|
|
# defined unless ZLib can be found.
|
|
|
|
#=============================================================================
|
|
# Copyright 2002-2009 Kitware, Inc.
|
|
#
|
|
# Distributed under the OSI-approved BSD License (the "License");
|
|
# see accompanying file Copyright.txt for details.
|
|
#
|
|
# This software is distributed WITHOUT ANY WARRANTY; without even the
|
|
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
# See the License for more information.
|
|
#=============================================================================
|
|
# (To distribute this file outside of CMake, substitute the full
|
|
# License text for the above reference.)
|
|
|
|
if(PNG_FIND_QUIETLY)
|
|
set(_FIND_ZLIB_ARG QUIET)
|
|
endif()
|
|
find_package(ZLIB ${_FIND_ZLIB_ARG})
|
|
|
|
if(ZLIB_FOUND)
|
|
find_path(PNG_PNG_INCLUDE_DIR png.h
|
|
/usr/local/include/libpng # OpenBSD
|
|
)
|
|
|
|
list(APPEND PNG_NAMES png libpng)
|
|
unset(PNG_NAMES_DEBUG)
|
|
set(_PNG_VERSION_SUFFIXES 17 16 15 14 12)
|
|
if (PNG_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\..*)?$")
|
|
string(REGEX REPLACE
|
|
"^([0-9]+)\\.([0-9]+).*" "\\1\\2"
|
|
_PNG_VERSION_SUFFIX_MIN "${PNG_FIND_VERSION}")
|
|
if (PNG_FIND_VERSION_EXACT)
|
|
set(_PNG_VERSION_SUFFIXES ${_PNG_VERSION_SUFFIX_MIN})
|
|
else ()
|
|
string(REGEX REPLACE
|
|
"${_PNG_VERSION_SUFFIX_MIN}.*" "${_PNG_VERSION_SUFFIX_MIN}"
|
|
_PNG_VERSION_SUFFIXES "${_PNG_VERSION_SUFFIXES}")
|
|
endif ()
|
|
unset(_PNG_VERSION_SUFFIX_MIN)
|
|
endif ()
|
|
foreach(v IN LISTS _PNG_VERSION_SUFFIXES)
|
|
list(APPEND PNG_NAMES png${v} libpng${v})
|
|
list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d)
|
|
endforeach()
|
|
unset(_PNG_VERSION_SUFFIXES)
|
|
# For compatiblity with versions prior to this multi-config search, honor
|
|
# any PNG_LIBRARY that is already specified and skip the search.
|
|
if(NOT PNG_LIBRARY)
|
|
find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES})
|
|
find_library(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG})
|
|
include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
|
|
select_library_configurations(PNG)
|
|
mark_as_advanced(PNG_LIBRARY_RELEASE PNG_LIBRARY_DEBUG)
|
|
endif()
|
|
unset(PNG_NAMES)
|
|
unset(PNG_NAMES_DEBUG)
|
|
|
|
# Set by select_library_configurations(), but we want the one from
|
|
# find_package_handle_standard_args() below.
|
|
unset(PNG_FOUND)
|
|
|
|
if (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
|
|
# png.h includes zlib.h. Sigh.
|
|
set(PNG_INCLUDE_DIRS ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
|
|
set(PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS} ) # for backward compatiblity
|
|
set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
|
|
|
|
if (CYGWIN)
|
|
if(BUILD_SHARED_LIBS)
|
|
# No need to define PNG_USE_DLL here, because it's default for Cygwin.
|
|
else()
|
|
set (PNG_DEFINITIONS -DPNG_STATIC)
|
|
endif()
|
|
endif ()
|
|
|
|
endif ()
|
|
|
|
if (PNG_PNG_INCLUDE_DIR AND EXISTS "${PNG_PNG_INCLUDE_DIR}/png.h")
|
|
file(STRINGS "${PNG_PNG_INCLUDE_DIR}/png.h" png_version_str REGEX "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\".+\"")
|
|
|
|
string(REGEX REPLACE "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\"([^\"]+)\".*" "\\1" PNG_VERSION_STRING "${png_version_str}")
|
|
unset(png_version_str)
|
|
endif ()
|
|
endif()
|
|
|
|
# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if
|
|
# all listed variables are TRUE
|
|
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
|
|
find_package_handle_standard_args(PNG
|
|
REQUIRED_VARS PNG_LIBRARY PNG_PNG_INCLUDE_DIR
|
|
VERSION_VAR PNG_VERSION_STRING)
|
|
|
|
mark_as_advanced(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )
|